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CHANGES OF STATE Chemistry Standard 7c WHAT IS A CHEMICAL CHANGE? Two or more substances react and make something completely different Example: Something burns rusting Explosive sodium and poisonous chlorine make table salt (Na + Cl NaCl) WHY IS SALT SO STABLE? When salt is made, it forms a lattice, or a strong cube structure. Positive Sodium is attracted to negative Chlorine WHAT IS A PHYSICAL CHANGE? Change in size, shape, amount, state but NOT a change in substance! Examples: ice melting Cutting an apple in half Pouring Mt. Dew into a glass Melting point Boiling point Description of Phase Change Term for Phase Change Heat Movement During Phase Change Solid to liquid Melting Heat goes into the solid as it melts. Liquid to solid Freezing Heat leaves the liquid as it freezes. Liquid to gas Vaporization, which includes boiling and evaporation Heat goes into the liquid as it vaporizes. Gas to liquid Condensation Heat leaves the gas as it condenses. Sublimation Heat goes into the solid as it sublimates. Solid to gas IMPORTANT VOCABULARY Boiling point: temperature at which a liquid turns into a gas (Endothermic) Freezing Point: temperature at which a liquid turns into a solid (exothermic) Melting Point: temperature at which a solid turns into a liquid (endothermic) Condensation: process of gas becoming liquid Vaporization: process of liquid becoming gas Sublimation: process of a solid turning into a gas Watch water go through phase changes! Here